A customer asked me recently what EMC’s advice is regarding duplexing Oracle redo logs. There is a thought behind this – Oracle redo logs are sensitive to data corruption – if redo logs are corrupt, there is no way to nicely recover the database to a technically consistent state (at least not without restoring data from backups).
This is what Oracle tells you:
Oracle recommends that you multiplex your redo log files; the loss of the log file information can be catastrophic if a recovery operation is required.
Duplexed Redo
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Dirty Cache 